Loop-former for sewing-machines.



J. W. DARLEY, JR. LOOP F 0RMER FOR SEWING MACHINES.

APPLICATION HLED APR- 2' I910.

Patented Apr. 6, 1915.

3 SHEEIS-SHEE'I 1.

J. .w. DARLEY, JR-

L OOP FORMER FOR SEWING MACHINE S.

memory FILED APR- 2,191.0.

3 SHEETSBHEET 2.

' P atented Apr. 6, 1915, I

J. W. DARLEY, JR.

LOOP FORMER FOR SEWING MACHINES.

APPLICATiON FILED APR. 2, 1910.

1 ,134,946, Patented Apr. 6 1915.

3 SHEETS-SHEET 3.

51mm m foz JWJJarZeyJr hZZ whom it may mm.-

' mo um t: s'nwrne-iymcnmns.

Be t kno n that 1, Jo n W. J r., a citlzen of the United States, residing at Baltimorefin the Stete of Maryland, have:

= make and use the same. v v

My invention relates to improvements in loop formers for sewing machines and is of general application to alllzindsof sewing maehin'esJ It is well known that in the ordinary sewing machine asst present constructed, the

. loop in the needle'threed is formed by the action of the resistance of the work, upon the thread while the needle is beingdrawn back. In sewing machines which operate at a very high speed, orwhich operate'gupon v a very thin fabric efi'ording small resistance to the passage of the thread, this resistance is not always sufficient to'produce theiloop,

l the resultheing-that. stitches are shipped and the sewing isim'pe'rfect 'Veriofis at- I e revolutmnm; the machine showm bntmy v tempts to. remedy this-hevebeen made, ,s uch as by using paper or backing for'the jthinfabric, in'order toincre'ese thislresisiienc'e,

but this is unsatisfactory-esthe-appearance of the goods is eptatob'e nnsightlyhenqil it'is trou'bieseme to remove the emperor-heck. ing. By my invention, however, theg'lgloop is positively and automatically formed by. the parts of the machine itself, no matter whether the resistance due-j to the febric'islu, v r I pertsheingofle well lmownconstruction-z large or small. x

With this object in yiew against the end i'ofthepl'ete 3, being secured v 7 consists in the construction fend combine tions of parts as hereinafter describ'edfend claimed. i t f in the eccornpanying. drewings Figure 11 l is a" side elevation, showings machine 105 3,; .T well known type equipped with pay improyea ment, the sewing m'BCl'laI11Sm,dI'1 VlDg n eehag v nism, tension mechanism, 'en dltakemp mechanism being all of well known or standard types. Fig. 2 is a, cross-section throughthe end of the machine containing. the shuttle,

specification of Letters Patent. Application filed'April f2, 1910., Serie1Noi-553fl2 t JO W,- D g YJJR, insets-Heroes; ntAe'YL n Patented and showingthe needle in the iosition of rest. Fig. 3 is a cross-section thereof taken onthe line 3i 3 of Fig. 2. ,Fig. 4 is atop plan iew thereof, the guard and supportlng platebeing shown in cross-section." .Fig, 5 shows the loop former enlarged, with the gripper operating upon the needle thread. Fig. 6 is a; perspective View, on a larger scale, showing the shuttle and related parts.

Fig. 7 is amend View of thee-shuttle and re- .le'tedparts, showing the needle just after the loop hes been formed. Fig. 8 ise view of the shuttle and related parts just atfthe end of the sewingendloop forming operetion. Eig 19 ,is'mpergspective iew; On a larger scale, of part of theshuttle and loop the loop is beginning to be formed, and Fig.

- IOis'e top plan'vie'w of the loop former and related parts, on a larger scale, the needle being shownin cross-section. v I

1 represents a sewmg'machlne of any ap proved type, and the usual operetingmeansj ilormingflevices, showing the parts just as and well known 'in the art. The shaft 2,"

however, has a vibratory motion of one-half invention i ap l e t yi f rm 'Qf ewe ing'machine, One end of the shefti'z. passes through is perforetion in the hotto of the. machine, which; therefor, This bearing, plete is hollowed aweyms shown s te, forfit he" driving, mes e 1 mnism,-\and also, is shown 9th, the end being protected by: e givoted gnerdgfiynormelly. heldin position 'ythespring 'i, allot these,

8; represents e ring, adapted to be screwed therein hyi screwspessing"through. theope e,

s; e inedgin p s tive hi therih '8 byjscrew's -ent'ermg the holes 1 Qnt feend of the'sheft 2 is screwed fl' jeii' culan enlargement 18, which; is prov ded wither; erni it, which is exp ended, forming any spring-operated means may be adapted to engage.

The top of the ring 8 is cut away, as

shown in Fig. 6, and against one edge of the cut away portion is fitted a screw 22, which is provided with a shoulder and confines the plate 23 on the top of the ring. Pivotally -mounted upon the shouldered portion of the screw 22, is the loop former 24, which consists of a horizontally extending arm pro- K vided with a downwardly curved portion 25. It is also provided witha cut away portion 26, provided with teeth and slightly larger than the diameter of the needle, so that it may embrace the rear side of the needle momentarily at the, proper time. Attached to the loop former near its center and opposhown at 28.

site the toothed portion, is'a projection 27,

which inclines downwardly and inwardly, as best. shown in Fig. 9, and is beveled ofi as The purpose of the loop former is to momentarily engage the needle threads on the side of the needle on which the shuttle takes the .loop, By having the loop former curved downwardly as shown at 25, two results are obtained. A firm bearing for the loose end of the loop former is provided, and the loopformer is prevented from moving too far in the direction in which it aproaches the needle, should. the machine be runwithout a needle. The end 25 is curved downwardly, so that at times it may engage the incline 29 on one end of'the ring 8, and a stop 30 is provided on said end, so as to limit the movement of the loop former in one direction. lhe screw 22 is provided with a cylindrical washer, and the perforated end of the loop. former isheld in place between the. top of said washer and the head of the screw 22.v Around this washer is coiled a. spring 31, one end being secured to the plate .23, and the other bearin against the loop former, said spring ten ing always to bring the loop former toward the needle. The shuttle is of any ordinary or well known type. i

The operation is ans-follows: As the needle reaches practically the lowest limit of its motion and begins to rise, as shown in Fig. 6,

the hook 32 of the shuttle has just disengaged the projection 27, allowing the spring.

31 to move the loop former toward the needle, whereupon said loop former engages I stitch formin menace the thread as the needle commences to rise, as shown in Figs. 5, 9, and 10, which show the needle after it has moved back a short distance from the position shown in Fig. '5. As,shown in Fig. 9, the hook 32 is just upon the pointof entering the loop, and as it en ters the loop it strikes the projection 27 or the loop former throwing the latter aside, until as shown in Fig. 7, the hook 32 has entirely engaged the loop and the loop former is pushed back. The sewing operation then continues, the shuttle being moved around into theposition shown in Fig. 8, at which time the take-up lpulls the loop upward to pull the same t1 t upon the bottom of the fabric. Just be ore the parts reach the position shown in Fi 8, the shuttle is disengaged from the pro ection 27, but the arm 15 takes its place, preventing the loop .former" from striking the thread-and leaving a space, as shown in Fig. 8, through which the loop may be drawn tight the parts being so constructed as to afi'ord the proper clearance. It should be noted that the loop former is entirely kept out of operation and does not interfere in the slightest with the action of themachine, except that it momentarily engages the thread when the loop is formed, as already described and as shown in Figs. 5, 9, and 10. It should also be noted that the loop former may be operated by any desired means.

While in the drawings my invention has been shown in connection with a lml: stitch, it is equally applicable to chain stitch machines, to machines having double needles,

and in fact to-every sewing machine in which a loop is formed in the needle thread.

I claim 1. The combination of a needle adapted t carry a thread, a coiiperating stitch forming mechanism, a toothed member adapted to press upon said thread on the side of the needle next to said cotiperating stitch forming mechanismto form a loop therein, means for operating said needle and cofiperating mechanism.

2. In a sewing machine, the combination with a needle adapted to carry a thread and means for reciprocating said needle, with a loop former adapted, during the withdrawal of the needle, to hold said thread, thereby forming a loop, a shuttle, and shuttle-operating means, said parts being so constructed that the loop former is held out of enga ementwith said needle, except momentari y,

at one-time by the shuttle, and at another time by the shuttle operating means, suhstantiallydescribed.

3. In sewing machine, "the combination of a nee e adapted to carry a thread, means for reciprocating said needle, aispring-con trolled loop former, adaptedrth press the thread against the needle during the withwee-me drawal of the latter, thereby forming a loop, ashuztle, and shufii'le operating means, said 100p fennel being provided with a, projectien extending into the path of the shuttle and into the path of .the shuttle operating means, whereby the loop former is held out of connection with said thread except momentm'iiy, first by the huttle and then by J the shuttle operating means, substantiall i 24 described. .l In testimony whereof, I aflix my signa ture, in presence of two Witnesses. JOHN W. DARLEY, JR.

Witnesses H. T. MOKEEVER, B. H. DAILEY. 

